1CC on the first run? Nice, I knew it was on the easy side for people used to these types of games. I suppose thinking it's too short is a good problem to have because you enjoyed playing! I tried to make one short level that is pretty well designed rather than longer or multiple levels that aren't. People tend to play jam games for 5 minutes or less.
This game uses bleeding edge WebAssembly features, particularly GC and tail calls, that are not generally available in stable releases of all browsers yet. By the end of the year they will be everywhere.